r/aws_medialive_multiplex: add CRUD operations

.changelog/26608.txt

@@ -0,0 +1,3 @@
+```release-note:new-resource
+  aws_medialive_multiplex
+```

internal/provider/provider.go

@@ -1725,6 +1725,7 @@ func New(_ context.Context) (*schema.Provider, error) {
 
 			"aws_medialive_input":                medialive.ResourceInput(),
 			"aws_medialive_input_security_group": medialive.ResourceInputSecurityGroup(),
+			"aws_medialive_multiplex":            medialive.ResourceMultiplex(),
 
 			"aws_media_store_container":        mediastore.ResourceContainer(),
 			"aws_media_store_container_policy": mediastore.ResourceContainerPolicy(),

internal/service/medialive/medialive_test.go

@@ -0,0 +1,29 @@
+package medialive_test
+
+import (
+	"testing"
+)
+
+func TestAccMediaLive_serial(t *testing.T) {
+	testCases := map[string]map[string]func(t *testing.T){
+		"Multiplex": {
+			"basic":      testAccMultiplex_basic,
+			"disappears": testAccMultiplex_disappears,
+			"update":     testAccMultiplex_update,
+			"updateTags": testAccMultiplex_updateTags,
+			"start":      testAccMultiplex_start,
+		},
+	}
+
+	for group, m := range testCases {
+		m := m
+		t.Run(group, func(t *testing.T) {
+			for name, tc := range m {
+				tc := tc
+				t.Run(name, func(t *testing.T) {
+					tc(t)
+				})
+			}
+		})
+	}
+}